Process for the dyeing and printing of fabrics containing cotton fibers, preliminarily immunized, which are combined with other fibers



Patented Mar. 1, 1932 UNITED. STATES PATENT OFFICE ROBERT PETITDIDIER AND FRANCOIS VICTOR FEYNIEIR, OF PAR-IS, FRANCE, ASSIGNOBS TO ETABLISSEMENTS PETITDIDIER (AN CIENNE MAISON JOLLY-BELIN), .OF ST.-

DENIS, FRANCE PROCESS FOR THE DYEING AND PRINTING OF FABRICS CONTAINING COTTON FIBERS, PRELIMINARILY IMMUNIZED, WHICH ARE COMBINED WITH OTHER FIBERS No Drawing. Application filed November 2, 1926, Serial No. 145,911, and in France November 12, 1925.

The present invention relates to a process for the coloring, either by dyeing or by printing, of textile fabrics which essentially consist of what is termed immunized cotton, for instance such as is manufactured by the Socit Sandoz et Cie., under British Patent No. 1,195,619 of March 20, 1923, and of ordinary cotton, in which process only the immunized cotton will remain colored. However, the fibers of the ordinary cotton may be subsequently dyed with a different color.

We have ascertained that when the different textile fabrics are colored by means of dyestuffs having anthraquinone as a base, these being simply diluted in the known manner, i. e. by an intimate mixture with water in such manner that the color remains in suspension, the color will react differently upon the fibers of the immunized cotton and upon the fibers of the ordinary cotton, and we thus obtain upon the immunized cotton various colors which are very distinct and brilliant and are more substantial after rinsing than the colors obtained upon the fibers of the ordinary cotton.

In the case in which the textile fabrics are printed, the diluted colors are thickened in the known manner by means of gum or like substance, and are fixed in the usual manner by steaming.

The following colors may be employed in our said process:

1. The amino-hydroxy, diamino, tetra-- mino, methyl-amino, or dimethyl-diamino anthraquinones, certain of which are known in France as acetoquinonesfin England as duranol, in Switzerland as cibacet and in Germany as azonine or colors for acetate.

2. Certain acid colors such as citronine, roccelline, solid blue for silk, and the like.

3. Basic colors employing tannin or acetanol as a mordant.

We have further observed that the colors which are printed or dyed upon immunized cotton are but little sensitive to the action of the reducing agent which consists of sodium hydrosulfite, while on the contrary, under the action of this reducing agent the aforesaid colors will almost entirely disappear from the other cotton fibers, so that this will afford by printing upon thecomposite fabrics a different aspect from what has been hitherto produced; the dyeing process will produce effects of double color after the weaving.

In particular, if we employ a fabric which comprises for instance a cotton backing andwhich is embroidered with the immunized cotton, this being printed in the above-mentioned conditions, we can obtain by immersion in the hydrosulfite bath an almost complete discoloring of the said cotton backing, should it be desired to obtain a white backing, and this backing can be optionally dyed with another color.

The process of coloring either by dyeing or printing comprises the following o erations, in the caseof fabrics composed o immunized cotton and ordinary cotton.

(a) The operation is commenced by dyeing or printing the fabric in the known man-v ner by the use of the above-mentioned colors.

(1)) If the fabric has been printed, the color is fixed by the steaming process. The fixing action should not exceed ten minutes, and it should be performed at a pressure which is near atmospheric pressure. During this operation the color is fixed upon the fibers of the immunized cotton, whilst it is only fixed in an incomplete manner upon the cotton backing.

(a) The fabric is then rinsed and during this operation, the colors with which the ordinary cotton is impregnatedwill be somewhat attentuated.

(d) Finally, the fabric is immersed in a bath of sodium hydrosulfite, in the proportion of 0.5 grams per liter of water, the bath being heated to about degrees C. During this operation, all the'parts of the fabric except the fibers of the immunized cotton will be discolored.

The fabric may be used in its original state or it may be treated with a color which acts upon the cotton, without appreciable change in the color which has been acquired by the immunized cotton during the first operation If after the immersion in the hydrosulfite bath the backing is still somewhat colored, the fabric may be immersed in potassium pertain the desired result.

manganate and in bisulfite of soda, in order to obtain a whiter backing, and thus to at- The immersion in the permanganate and the bisulfite may in some cases be replaced by an immersion in chlorine water, if the printing colors contain'no blue pigment.

Obviously,- the above-mentioned process is susceptible of various modifications without departing from the spirit of the invention, and in particular, the figures given forthe proportions, temperatures and pressures are SllbJGCt to modifications.

What we claim is: V a

1. A color printing or dyeing process for composite fabrics composed of cotton which has been preliminarily immunized with other fibers consisting of ordinarycotton, which consists in printing or dyeing the fabric with insoluble colors of an anthraquinone base mixed with water and adapted to produce dyeing reactions upon the immunized cotton, fixing the printed colors and rinsing the fabric in a bath for removing all color from the fibers which are not the immunized cotton fibers.

2. A color printing or dyeing process for composite fabrics composed of cotton which has been preliminarily immunized, with other fibers consisting of ordinary cotton, which consists in printing or dyeing the fabric with insoluble colors of, an anthra uinone base mixed with water and adapte to produce dyeing reactions upon the immunized cotton, fixing the printed colors and rinsing the fabric in a reducing bath for removing all color from the fibers which are not the immunized cotton fibers.

3. A color printing 0rd eing process for I composite fabrics compose of cotton which has been preliminarily immunized, with other fibers consisting of ordinary cotton, which consists in printing or dyeing the fabric with insoluble colors of an anthraquinone base mixed with water and adapted to pro duce dyeing reactions upon the immunized composite fabrics composed of cotton, which has been preliminarily immunized, with other fibers consistingof ordinary cotton, which consists in printing or dyeing the fabric with insoluble colors of an anthraquinone base mixed with water and adapted to produce dyeing reactions u on the immunized cotton, fixing the printe colors, rinsing the fabric in a bath for removing all color from the fibers which are not the immunized cotton fibers and subsequently dyeing the fabric in a bath which reacts upon the fibers of the fabric without changing the color of the immunized cotton fibers.

6. A color printing or dyeing process for composite fabrics composed of cotton which has been preliminarily immunized, with other fibers consisting of ordinary cotton, which consists in printing or dyeing the fabric with insoluble colors of an anthraquinone otton, fixing the printed colors and rinsing the fabric in a bath. of sodium hydrosulfite for removing all color from the fibers which are not the immunized cotton fibers.

fibers which are not theimmunized cotton 5. A color -printingordyeing process for 

